Rainwater Harvesting Controller Kit with ESP32 + Ultrasonic Smart 2
Take Charge of Water Security with ESP32 Rainwater Harvesting Automation
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
You'll construct a hands-free system that senses rainfall, fills your tank without contamination, and manages pumping based on real-time levels. This kit puts you in control of rooftop water harvesting, automating the exact first-flush diversion sequence that keeps debris and dissolved bird droppings out of stored water. When rain starts, the ESP32 reads the rain sensor, holds solenoid valves open to dump the initial dirty runoff, then closes them for clean collection — a full-cycle water manager built by you.
What You'll Build
A standalone controller that monitors overhead and sump tank levels via dual HC-SR04 ultrasonic sensors, detects rainfall, and measures harvested water volume with a YF-S201 flow meter. The 4-channel relay module drives solenoid valves for first-flush diversion and pump control, while the OLED displays live status. A DS3231 real-time clock logs data to a microSD card, so you can analyse collection patterns over monsoon seasons.
What You'll Learn
- Interfacing multiple sensors (ultrasonic, rain, flow) on the ESP32 and resolving timing conflicts
- Programming a state machine for first-flush diversion: timing valve openings, volume thresholds, and fallback logic
- Configuring an RTC to timestamp flow data and trigger maintenance reminders
- Designing a stable 12V/5V power bus using a buck converter and filtering capacitors for reliable relay operation
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| HC-SR04 | 2 |
| Rain Sensor | 1 |
| YF-S201 Flow Sensor | 1 |
| 4-ch Relay Module | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| LM2596 Buck Converter | 1 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| Waterproof Enclosure | 1 |
| 12V Adapter | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Ideal for B.Tech ECE/EEE students tackling water sustainability projects, Smart India Hackathon participants building rural automation prototypes, and researchers at IITs or NITs validating rooftop rainwater harvesting models. Also well-suited for faculty-led ATL Tinkering Labs in higher secondary schools that want to demonstrate tangible IoT-based resource management.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code to start a conversation with the AI companion. It can walk you through the exact wiring, code logic tweaks, and calibration steps. If you need human help, our WhatsApp support team responds within hours.
Can the kit handle rooftop areas larger than 1000 sq ft?
Absolutely. The YF-S201 flow sensor measures up to 30 litres per minute. For large catchments, use it on the downpipe before the first-flush diverter. The controller logic scales; you only need to adjust the diversion volume threshold in code.
Do I need extensive plumbing modifications?
No. The kit works by inserting a T-joint for the rain sensor and splicing the existing downpipe to fit the solenoid valve and flow meter. Standard 1/2" PVC fittings and a drill are all you need on the plumbing side.
Is the enclosure truly monsoon-proof?
Yes, the provided waterproof enclosure is IP65 rated. The PCB sits securely inside, and all sensor cables exit through watertight gland nuts. The 12V adapter is also designed for outdoor use in Indian weather.
HC-SR04 tank level + rain sensor + flow meter + solenoid valves manage first-flush diversion and pumping.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items